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https://issues.apache.org/jira/browse/SOLR-4048?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Shawn Heisey resolved SOLR-4048.
--------------------------------
Resolution: Fixed
Fix Version/s: 5.0
> Add a "findRecursive" method to NamedList
> -----------------------------------------
>
> Key: SOLR-4048
> URL: https://issues.apache.org/jira/browse/SOLR-4048
> Project: Solr
> Issue Type: New Feature
> Affects Versions: 4.0
> Reporter: Shawn Heisey
> Assignee: Shawn Heisey
> Priority: Minor
> Fix For: 5.0, 4.4
>
> Attachments: SOLR-4048-cleanup.patch, SOLR-4048.patch,
> SOLR-4048.patch, SOLR-4048.patch, SOLR-4048.patch, SOLR-4048.patch,
> SOLR-4048.patch, SOLR-4048.patch
>
>
> Most of the time when accessing data from a NamedList, what you'll be doing
> is using get() to retrieve another NamedList, and doing so over and over
> until you reach the final level, where you'll actually retrieve the value you
> want.
> I propose adding a method to NamedList which would do all that heavy lifting
> for you. I created the following method for my own code. It could be
> adapted fairly easily for inclusion into NamedList itself. The only reason I
> did not include it as a patch is because I figure you'll want to ensure it
> meets all your particular coding guidelines, and that the JavaDoc is much
> better than I have done here:
> {code}
> /**
> * Recursively parse a NamedList and return the value at the last level,
> * assuming that the object found at each level is also a NamedList. For
> * example, if "response" is the NamedList response from the Solr4 mbean
> * handler, the following code makes sense:
> *
> * String coreName = (String) getRecursiveFromResponse(response, new
> * String[] { "solr-mbeans", "CORE", "core", "stats", "coreName" });
> *
> *
> * @param namedList the NamedList to parse
> * @param args A list of values to recursively request
> * @return the object at the last level.
> * @throws SolrServerException
> */
> @SuppressWarnings("unchecked")
> private final Object getRecursiveFromResponse(
> NamedList<Object> namedList, String[] args)
> throws SolrServerException
> {
> NamedList<Object> list = null;
> Object value = null;
> try
> {
> for (String key : args)
> {
> if (list == null)
> {
> list = namedList;
> }
> else
> {
> list = (NamedList<Object>) value;
> }
> value = list.get(key);
> }
> return value;
> }
> catch (Exception e)
> {
> throw new SolrServerException(
> "Failed to recursively parse
> NamedList", e);
> }
> }
> {code}
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